I have studied lead acid battery charging methods from the website http://batteryuniversity.com/learn/article/charging_the_lead_acid_battery. In which they mention three stages of charging:
My question: I already made a PWM solar charger unit using the P-MOSTFET IRF4905, in which I can control the PWM duty cycle and can be reduce the current, but when reducing the current the voltage applied to the battery will also be reduced, then how can I implement these three stage of charging by use of PWM? i.e. constant current mode ok, but how can we apply top charging?